bog rhubarb vs Petasites hybridus

bog rhubarb and Petasites hybridus both are nouns.

Word	Noun	Adjective	Verb	Adverb
bog rhubarb	Yes	No	No	No
Petasites hybridus	Yes	No	No	No

As nouns, bog rhubarb and Petasites hybridus are synonyms defined as:

bog rhubarb and Petasites hybridus: small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas

Other synonyms of bog rhubarb include butterbur, Petasites vulgaris.

bog rhubarb (noun)	Petasites hybridus (noun)
small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas	small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas